Explanation Let’s consider there was X m g / k g plutonium-239. Now we know that after each half life the amount becomes half of the initial amount. Thus, after n half life amount remaining in a radioactive sample is X × ( 1 / 2 ) n According to the question, X × ( 1 / 2 ) n = 1 m g / k g Number of half life

Introduction to General, Organic and Biochemistry

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ISBN: 9781285869759

Author: Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Publisher: Cengage Learning

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Concept explainers

Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.

Question

Chapter 9, Problem 9.33P

Interpretation Introduction

Interpretation:

The amount of plutonium-239 per kg of rock was there in the rock 100000 years ago when 1 mg/kg plutonium-239 is there at present time should be determined.

Concept Introduction:

Radioactive disintegration is a first order reaction. So, amount in a substance can be calculated using the concept of half life.

Expert Solution & Answer

Chapter 9 Solutions

Introduction to General, Organic and Biochemistry

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239Pu is a nuclear waste byproduct with a half-life of 24,000 y. What fraction of the 239Pu present today will be present in 1000 y?
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Solution Summary: The author explains that the amount of plutonium-239 per kg of rock was there in the rock 100000 years ago.

Concept explainers

Chapter 9 Solutions